Answer
C.
Work Step by Step
A., B., and D. are irrelevant for vaccine durability. It is the changeability of the viruses which makes an old vaccine unable to help the immune system recognize a new version.
Biology (11th Edition)
by Raven, Peter; Johnson, George; Mason, Kenneth; Losos, Jonathan; Singer, Susan
Published by
McGraw-Hill Education
ISBN 10:
1259188132
ISBN 13:
978-1-25918-813-8
Chapter 27 - Viruses - Review Questions - Apply - Page 543: 7
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